an erupting volcano facing japan. a volcano erupted in southern japan spewing ash and lava but the major threat is the growing nuclear crisis in the aftermath of last weeks killer quake. they say japan has declared a state of emergency at an earthquake affected nuclear plant where higher permitted levels of radioactivity was seen a precaution in case a radioactive cloud escapes from the plant located 124 miles away from tokyo. a partial meltdown occurred yesterday at number one reactor. there is a hydrogen bubble of the number three reactor which could lead to an explosion. a shortage of electricity means power is being rationed with rolling blackouts in tokyo and other cities. >> reporter: this is could be the worst nuclear disaster since chernobyl 25 years ago. >> we're not out of the woods yet. >>. >> reporter: they say partial melt downs could have occurred at two reacters and they are facing problems at three more. >> first, the back-up systems failed. the pumps and electricity were all gone. this was not supposed to happen. >> the unusual combination of events has brought japan to

including what's going on in japan. joins us now from new york to tell us what's come up at 7:00 on "gma." . >> that's right. good morning, janelle. coming up on the show, we'll have the latest on the major setback in japan. japanese power company officials say they knew about extremely high radiation levels before three workers suffered severe burns. we'll have more on the new details coming up in the show. also ahead, a new warning about artificial food coloring. the government says it may worsen hyperactivity in some kids. and now the f.d.a. is looking to taking action. plus new research shows that 51% of americans over the age of 12 are on facebook. we'll take a look at how the social media giant is changing the way we communicate. and incredible images of a man who spotted a massive shark and unlike everyone else and everything else we do, instead of turning away, he decided to grab his kayak and paddle out for a closer look. we'll talk to him later on this morning in this show. it's pretty incredible. he went out towards the shark and lived to tell about it. >> we wish you were he

, a miracle rescue in japan. rescuers find two earthquake survivors nine days after that horrible earthquake and tsunami. also what u.c. berkeley scientists found after checking radiation levels in the air. >>> at last encouraging news about the crippled nuclear plant. japanese authorities just announced that two of the six units are now under control after the fuel storage pools have cooled down. there are new concerns about food and water safety, but first something uplifting. david wright shows us the rescue of two survivors more than a week after the massive earthquake hit. >> late today a dramatic bit of hopeful news, a miracle rescue. they freed an 80-year-old woman and grandson trapped since the tsunami. the two survived nine days eating yogurt from the fridge until the grandson stood on the rooftop. japanese coastguard released new video of the tsunami before it hit shore. as it passes right under the bow of coastguard cutter you get a sense of how enormous it is. on land they are still dealing with the damage from the tsunami. they eased pressure on the reactor but releasing steam b

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